As we said, today at abc news, across all of our programs and our website, we have been asking questions about how we all move forward, after the tragedy at sandy hook. The search for solutions, together. Including, tonight, troubled children. In the last few days, parents have been coming out of the shadows to speak to us about their own children. Abc's john donvan has their stories. Reporter: There are homes that know nothing of the reality ofng a troubled child. And then there are those that do. Liza long put her home in the second group in a blog posting this weekend called "i am adam lanza's mother" that rocketed around the world. "I love my son," she wrote. "But he terrifies me." My biggest fear is that some day he'll fly into a rage and hurt me or hurt himself. Reporter: He is mientally ill," long writes, and as threatened her at times, even pulled a knife on her. She called it a cry for help. One that was immediately echoed in a remarkable way by other parents to abc news today. I'm afraid for my daughter. I am fearful for what will happen to her or what will happen to anybody that's around her if she snaps in a public place. Would this be her that I'm getting a phone call about? Reporter: It was connecticut that triered this. Yet, these parents' fears conflict with virtually all expert opinion about the mentally ill. Statistically, they are not dangerous to the community at large, nor do perpetrators of large-scale killings necessarily exhibit the kind of frequent explosive behavior those parents are worried about. One of the mothers of the two columbine killers, for example, told author andrew solomon -- in his new book, "far from the tr tree." Sue klebold had no sense that dylan was capable of doing, like what he did. She was shocked when it happened. Reporter: Yet, long did touch on something. She was, says the head of america's oldest mental health organizations -- speaking on behalf of literally thousands of families. Reporter: Thousands? Thousands of families that find the system to be extremely fragmented. Reporter: Which is not different from how the mentally ill used to be segregated in now shut-down state institutions. The better solutions, like child psychiatric wards in hospitals. Day programs where kids can get counseling in big doses. But those are in short supply in many states. Wyoming, for example, has six child psychiatrists in its half million population. Today, a call for action, a summit on childhood mental health by the american academy of adolescent and child psychiatry. Yeah, there's a lot that we do know. It's just that we don't comprehensively apply what we do know. Reporter: And that's because of money. I believe so, yes. Reporter: Money that's been shrinking while behind some of those front doors, the fears only get bigger. John donvan, abc news, washington. And if you're concerned about a family member, we posted resources on abcnews.Com. And tomorrow, we continue the search for solutions. We are going to look at the weapon the gunman used. One of the most popular guns in this nation.

This transcript has been automatically generated and may not be 100% accurate.

Day of Mourning in Newtown, Conn.

Funerals began for the victims of the Sandy Hook Elementary school shooting.

Who Was Newtown Gunman Adam Lanza?

Troubling picture of Connecticut mass murderer slowly emerges.

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